I did some of these some years back.  Remember that this isn't a once-only gig.
I found the best way was to record the URL somewhere safe, go through the whole seminar once taking copious notes and timestamps, think about what you have read, try things on Expedition, then go back again to the course and review the parts that don't make sense.  That's where the timestamps come in, Pete's jokes aren't that good the second time around!